Oil engine



E. A. SPERRY Jan. 13, 1931.

OIL ENGINE Filed Jan. 24, 1922' 1L1 W W Patented Jan. 13, 1931 UNITEDSTATES PATENT OFFICE ELMER A. SPERRY, OF BROOKLYN, NEW YORK, ASSIGNOR TOSPERRY DEVELOPMENT COMPANY, OF DOVER GREEN, DELAWARE, A CORPORATION OFDELAWARE OIL ENGINE Application filed January 24, 1922. Serial No.531,329.

This invention relates to internal combustion engines of theauto-ignition type in which liquid fuel is injected under heavypressure. In such engines the fuel is apt to pick up foreign matterafter it is placed under pressure, such as in the pumps or hlgh pressurepipes. It is the principal object of myinvention to provide a strainerfor said oil in advance ofits injection into the combustion cylinderwhich will be sufiiciently fine to separate out the small particles offoreign matter suspended in the fuel. It is essential that the pores ofthe strainer be of extreme fineness in order to filter effectively theforsign matter which is usually in the form of a suspension of lightparticles.

Referring to the drawings in which are shown what I now consider to bethe preferred forms of my invention:

Fig. 1 is a sectional detail of the strainer employed with the highpressure oil.

Fig. 2 is a detail on a greatly enlarged scale of the face of one of thesmall plates making up the oil strainer, showing the minute serrationsgreatly'magm'fied.

Fig. 3 is a magnified side view of two of said plates showing theirrelative. positions.

Fig. 4 is a sectionalview of a modified form of strainer.

Fig. 5 is a detached plan view of the strainer members before they areshrunk into the metal band.

While strainers for oil have of course been built for years, practicallyall of said strain- 5 ers, as far as I am aware, operate under gravityor under very low pressure. I find, however, that such strainers are notadapted for my type of engine, since the oil is a t to pick upforeign'matter after it is place un- 40 der pressure, such as in thepumps or high pressure ipes. The strainer I have shown at 24 consists ofa plurality of verythin strips of metal 40, 41, etc., one side 42 ofwhich is serrated like a very fine file, the serrated surfaces allfacing thesame way, as shown in Fig. 3. Such a strainer causespracticallno reduction in the pressure of the oil as it passes through and at thesame time filters out very efiectively all foreign.- matter, a metallicstrainer having special afiinity for iron filings. The stripsare firmlysecured together by a metal band 44- shrunk or clamped therearound andfurther, by being clamped between members 45 and 46, forming the casingby bolts 47. Preferably, rings 48, 49 of copper or other soft metal areplaced between the members 45, 46 and the strainer proper.

An alternative form of clamping the disks is shownin Fig. 4, a U shapedcopper ring being placed aroundthe disks.

In accordance with the provisions of the patent statutes, I have hereindescribed the principle of operation of my invention, together with theapparatus, which I now consider to represent the best embodimentthereof, but I desire to have it understood that the apparatus shown isonly illustrative and that the invention can be carried out by othermeans. Also, while it is designed to use the various features andelements in the combination and relations described, some of these maybe altered and others omitted without interfering with the more generalresults outlined, and the invention extends to such'use.

Having herein described my invention what I claim and desire to secureby Letters Patent is:

A strainer for oil pipes and the like, comprising a plurality of stripshaving serrated aces, anda ring having a U-shape section clamped aroundthe edge of said strips to form a laminated circular disc with thelaminations extending through the same.

In testimony whereof I have-.afiixed my sigiiature.

' ELMER A. SPERRY.

